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Senior Design I Digital LVDT Linear Variable Differential Transformer

IntroductionWhat is a LVDTHow does a LVDT workLVDT ApplicationsWhy Digital?Digital LVDT (our project)Key Electrical ComponentsSoftwareQuestions. Outline. Company: Trans-TekCEO: Paul V. Mondazzi Location: Ellington, CTTrans-Tek specializes in building - LVDTs, - ADTs

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Senior Design I Digital LVDT Linear Variable Differential Transformer

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    1. Senior Design I Digital LVDT (Linear Variable Differential Transformer)

    2. Introduction What is a LVDT How does a LVDT work LVDT Applications Why Digital? Digital LVDT (our project) Key Electrical Components Software Questions Outline

    3. Company: Trans-Tek CEO: Paul V. Mondazzi  Location: Ellington, CT Trans-Tek specializes in building - LVDTs, - ADTs (angular) - LVTs (velocity) Introduction

    4. Electrical transformer used for measuring linear displacement What is a LVDT?

    5. LVDT Applications

    6. It requires no periodic calibration. Its accuracy, resolution, and linearity does not change with time. No onsite calibration Eliminates the need for expensive error prone analog to digital conversion Conversion to calibrated units Why Digital?

    7. Objective: -To design a marketable digital output LVDT for industrial applications General Highlights: Internal microprocessor scales output into calibrated engineering units and provides unique, serialized calibration for unit identification Interchangeability without calibration Internal MIN, MAX and TIR functions store high and low readings at maximum update rates Internal tare and zero function allows unipolar and bipolar output, i.e. user programmable Support Software with GUI Researching competitors designs LVDT Project

    8. Microcontroller (candidate Pic16F870) 200 nanosecond instruction execution only 35 single word instructions 5 channels of 10-bit Analog-to-Digital (A/D) converter 64 bytes of EEPROM data memory 2 timers Design Choices

    9. Connection type: USB vs RS-485 USB Easy to use Inline power Small connections Limited to ~15 feet from the device RS-485 Spans up to 4000 feet 2 wire connection No power Larger connection than USB Design Choices (cont.)

    10. Ordering competitors products to reverse engineer Specs sheets available to us Research the approximate size of the housing Find out competitors price range (allowing us to create a realistic budget) Researching Competitors

    11. Key Electrical Specs

    12. Visual Basic Easy to use GUI MIN, MAX and TIR functions All the data will be transferred to a word file No onsite calibration is desired 15 bit (min.) USB or RS-485 Internal tare and zero function allows unipolar and bipolar output Software

    13. Spring Semester: Preliminary Conceptual Design -March 24 Component research and ordering -March 31 Circuit Prototype (protoboard) -April 26 Fall Semester: Surface Mounted Layout Software Development Final Design Time Line

    14. Research Budget $1000 (not final) This in addition to the purchase of the competitor’s LVDTs Production Budget Estimated $150 restraint on the production of each individual circuit This includes parts and labor Budget

    15. Questions ???

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